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(p200300d82f300b00cea90deed607041d.dip0.t-ipconnect.de. [2003:d8:2f30:b00:cea9:dee:d607:41d]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42b316775f2sm12777750f8f.16.2025.11.10.06.54.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Nov 2025 06:54:56 -0800 (PST) Message-ID: <69884a4d-60cb-4a66-a225-38d3a17712c6@gmail.com> Date: Mon, 10 Nov 2025 15:54:55 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] mm/khugepaged: do synchronous writeback for MADV_COLLAPSE To: Lorenzo Stoakes , Matthew Wilcox Cc: Shivank Garg , Andrew Morton , Zi Yan , Baolin Wang , "Liam R . Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Zach O'Keefe , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Branden Moore References: <20251110113254.77822-1-shivankg@amd.com> <9b622374-778a-4459-aca9-4eb406a58516@gmail.com> <2e6153c9-1729-463a-86b5-0973b3f56ea6@lucifer.local> From: "David Hildenbrand (Red Hat)" Content-Language: en-US In-Reply-To: <2e6153c9-1729-463a-86b5-0973b3f56ea6@lucifer.local> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 1590D20009 X-Stat-Signature: izmwspppwicshf4pg1w3sqd7i7yrfh1s X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1762786498-346836 X-HE-Meta: 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 hwOvefFK 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10.11.25 15:05, Lorenzo Stoakes wrote: > On Mon, Nov 10, 2025 at 02:03:43PM +0000, Matthew Wilcox wrote: >> On Mon, Nov 10, 2025 at 03:00:32PM +0100, David Hildenbrand (Red Hat) wrote: >>> On 10.11.25 14:47, Matthew Wilcox wrote: >>>> On Mon, Nov 10, 2025 at 11:32:53AM +0000, Shivank Garg wrote: >>>>> When MADV_COLLAPSE is called on file-backed mappings (e.g., executable >>>>> text sections), the pages may still be dirty from recent writes. The >>>> >>>> That explanation derails my brain entirely. Text isn't writable! How >>>> can the pages be dirty and file-backed text? >>> >>> Files are writable :) >> >> Well, if you're root ... >> >> -rwxr-xr-x 1 root root 158632 Jun 4 11:14 /bin/ls >> > > gcc foo.c -o foo && ./foo > > Is more the issue I think Yeah, that's my understanding as well. I guess stuff like package/container updates might similarly trigger it.